What should I upgrade next?

I heard the 802ds in a system where they replaced the 802s and I thought it was a significant upgrade (in the high end, of course). Otherwise, have not heard any of the other components. I AM a fan of computer audio, so you might explore in that direction.

What do you think your weakest component is? If not that, then what do you want to improve? Personally, I don't like your speakers. It doesn't really matter what I think, though. You're the one who has to listen to them.

I will say that your speakers and electronics are pretty well matched. It would be a good idea to focus on specifically what you want to improve. If you upgrade something without being sure, you can easily make a mistake.

I agree with Rlwainwright, take a look at tweaking the room.
I would also want dedicated AC to your outlets, and speaking of outlets what type are you using?

Should your room be tweaked to your satisfaction than the speakers would be my next concern. When you begin to hear what your don't hear so to speak, it may be time to upgrade your speakers. Beyond that it may be that expanding your system into a computer based or media server component will bring more joy and more use of a already fine system.